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A076959
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Number of primes between 3^n and 4^n.
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2
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0, 2, 9, 32, 119, 435, 1573, 5695, 20773, 76057, 279850, 1033937, 3837070, 14296494, 53468768, 200673056, 755606952, 2853697709, 10807617884, 41036410818, 156186010430, 595759180892, 2277112205791, 8720036044777, 33451314673521, 128533154571957
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OFFSET
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1,2
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LINKS
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FORMULA
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PROG
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(PARI) a(n) = primepi(4^n) - primepi(3^n); \\ Michel Marcus, Mar 22 2015
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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